The road becomes a freeway in the run-up to Interstate 540, which begins at the Oklahoma–Arkansas state line.

From here, the highway heads north toward Arkoma, paralleling the state line.

[citation needed] SH-112 intersects SH-9A in Arkoma, and one of the two highways continues to the state line.

Sources conflict as to which highway continues from this point, and the ultimate location of the northern terminus of SH-112.

[2] The most major change in SH-112's history came on February 5, 1973, when the highway was extended to Arkoma.